THE GREEN ALGAE OF NORTH AMERICA 13 



Page in, cancel reference to S. diluta Wood. 

 Page 113, after description of S. CRASSA, add, 

 Var. FORMOSA Transeau, 1915, p. 27. Slender, cells 80-95 X 

 80-270/1, spores 88-110 X 120-150 X 70-90/1. 111. 



Page 114. The specimens from Mass, and Washington re- 

 ferred to S. IOJTETIANA seem rather to belong to S. FALLAX 

 (Hansg.) Wille. Wolle's somewhat doubtful record is now 

 the only one for America. 



Under S. FLUVIATHJS, add, spores brown, scrobiculate. 



Page 115, under S. DUBIA var. LONGIARTICULATA, cancel 

 P. B.-A., No. 961. 



Under S. TENUISSIMA, cancel, P. B.-A., No. 456. 



Page 116, after description of S. TENUISSIMA, add, 



Var. RUGOSA Transeau, 1914, p. 291 ; P. B.-A., No. 456. 

 Cells 1 1-13 /u. diani. ; spores 28-32 X 55-64 p., membrane minutely 

 pitted. Mass., R. I., N. J., 111. 



Under S. INFLATA, cancel P. B.-A., No. 363. Add, 

 Var. FOVEOLATA Transeau, 1914, p. 291. Spore membrane 

 scrobiculate. 111. ,; 



P. 117, under S. GREVII^EANA, cancel P. B.-A., No. 362. 

 P. 119, after paragraph on S. ELONGATA, add, 



383. S. LAGERHEIMII Wittrock in Wittrock & Nordstedt, 

 Alg. Exsicc., No. 961, 1889, with figure; .S". porticalis var. 

 tenuispora Collins, 1912, p. 72. Cells 27-33 \L diam., 3-5 diam. 

 long ; dissepiments not replicate ; chromatophore single, 2.5-3.5 

 turns ; vegetative cells among fertile cells more or less swollen, 

 fertile cells slightly swollen on tube side ; spores ellipsoid with 

 pointed ends, 25-31 X 48-66/4, light brown; membrane finely 

 punctate. Mass., N. H., 111. Europe. 



39. S. CIRCUMLINEATA Trauseau, 1914, p. .293, PI. XXVI, 

 figs. 5-6. Cells 40-48 p. diam., 120-240/1 long; dissepiments 

 plane ; chromatophore one, making 4-8 turns ; fertile cell 

 swollen on tube side only ; spores ellipsoid, 40-50 X 70-125 //., 

 yellowish brown, outer wall marked by a more or less distinct 

 longitudinal line. 111. 



40. S. BORGEANA Transeau, 1915. p. 23. Filaments 30-35 /* 

 diam., cells 50-200 /* long ; dissepiments plane; one chromato- 

 phore, making 1.5-5 turns; fertile cells inflated on the outer 

 side, straight on the inner side ; spores ellipsoid, 33-40 X 

 54-70 fj., yellow, smooth. 111. 



